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This project provides firmware to turn an ESP32-C3 (or compatible ESP32 variant) into a multi-interface Reticulum Network Stack gateway node. It allows devices communicating via different physical layers (WiFi UDP, ESP-NOW, Serial, Bluetooth) to exchange Reticulum packets seamlessly. - AkitaEngineering/ESP32-C3-Reticulum-Node

kv4p HT is a free, open-source amateur radio transceiver project that allows users to build a VHF radio that plugs into an Android smartphone’s USB-C port, turning the phone into an off-grid device capable of voice and text communication.

Why I built an e-paper room air monitor for my flat and how the first MVP works: monitor unit with e-paper display, sensor and LED panel -> storage and forwarding to a FastAPI backend with SQLite -> visualisation in an interactive dashboard. TL;DR – In the cold season we tend to keep the windows closed. The air gets “stale”: humidity often rises above 60 %, which can harm our wellbeing and promote mould. At the same time the CO₂ level in the air increases, which impacts our ability to concentrate. So I built a room air monitor that stays unobtrusive as long as everything is in the green zone, but becomes deliberately noticeable once thresholds are exceeded. For my personal love of statistics I also visualise the measurements in a clear dashboard.

reference for powering esp32 with aa batteries

An script for the ESPHome flashed ESP devices to create a climate sensor in Home Assistent for DUEPI controlled pellet stoves - mvroosmalen1970/ESPHome-Duepi: An script for the ESPHome flashed ESP…

Control Duepi_evo based pellet stoves with Home Assistant over wifi using ESPLink (or any other Ser2TCP program) - aceindy/Duepi_EVO

Touchscreen Bluetooth MIDI Controller for the Cheap Yellow Display (CYD), an ESP32 Microcontroller with a built-in display. - NickCulbertson/CYD-MIDI-Controller

Get started with ESP32 Cheap Yellow Display (CYD) board using MicroPython firmware. Board introduction, preparing the libraries, display static text and images, and more